<template>
	<div class="todo-footer" v-show="todos.length>0">
		<label>
			<input type="checkbox" :checked="doneTotal===todos.length&&todos.length>0" @change="checkAll" />
		</label>
		<span>
			<span>已完成{{doneTotal}}</span> / 全部{{todos.length}}
		</span>
		<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
	</div>
</template>

<script>
	export default {
		name: 'MyFooter',
		props: ['todos', 'checkAllTodo', 'clearAllTodo'],
		methods: {
			checkAll(e) {
				this.checkAllTodo(e.target.checked)
			},
			clearAll() {
				this.clearAllTodo()
			}
		},
		computed: {
			doneTotal() {
				return this.todos.filter(todo => todo.done === true).length
			}
		}
	}
</script>

<style scoped>
	/*footer*/
	.todo-footer {
		height: 40px;
		line-height: 40px;
		padding-left: 6px;
		margin-top: 5px;
	}

	.todo-footer label {
		display: inline-block;
		margin-right: 20px;
		cursor: pointer;
	}

	.todo-footer label input {
		position: relative;
		top: -1px;
		vertical-align: middle;
		margin-right: 5px;
	}

	.todo-footer button {
		float: right;
		margin-top: 5px;
	}
</style>
